phy: hisilicon: hi6220-usb: drop unused module alias

The driver has never supported anything but OF probe so drop the unused
platform module alias.

Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/hisilicon/phy-hi6220-usb.c

···
 module_platform_driver(hi6220_phy_driver);
 
 MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
-MODULE_ALIAS("platform:hi6220-usb-phy");
 MODULE_LICENSE("GPL");